Socio-demographic and clinical characteristics of the 16 children with children’s interstitial lung diseases and their 47 matched controls.

aVariables in the previous 1 year. bThe occurrence of any of the following in the previous 6 months: autoimmune disease, chronic liver disease, chronic renal insufficiency, neurologic diseases with immobility, congenital heart disease, chronic lung disease, diabetes mellitus or malignancy. cFactors predisposing to infections in the previous 6 months. dInterstitial lung disease in the 6 months prior to or after index date. eBronchiectasis, chronic obstructive pulmonary disease, chronic bronchitis, pulmonary tuberculosis, pertussis or cystic fibrosis. *P<0.05.